A noncoherent approach to radar localization through unknown walls.

A simple and practical noncoherent approach to
through-the-wall radar detection and localization in the
presence of unknown walls is presented. The technique
corrects for the shifts introduced in target location estimates
due to ambiguities in the wall thickness and dielectric constant.
Data is collected using three independent monostatic singleantenna
radar units, employing stepped-frequency signals, at
two or more different standoff positions of the radar system
from the wall. In post-data acquisition processing, one of the
wall parameters assumes a fixed value. Localization is then
performed, for different assumed values of the other
parameter at different standoff positions, using a trilaterationbased
technique that incorporates the presence of the wall.
Target displacement trajectories, each corresponding to a
different standoff position, are then formed and the cross-over
point is estimated to be the target location. The results show
that the radar system is able to correctly locate targets behind
unknown walls.